Quinoa is a great food but I think its been a bit hyped up a bit too. Amaranth is also excellent nutrition wise. All whole grains are very nourishing when prepared properly (before modern food processing).

An important note with grains is that they only store well whole. Once ground into a flour sensitive oils and nutrients disperse throughout the starch and easily oxidize. Freshly ground or rolled makes a big difference flavor wise in my experience as well. Luckily quinoa and amaranth can be made into a porridge whole.